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How do I know if the reconstruction in the picture is a 2x2 reconstruction or not?

                                   crystallography

I believe that this corresponds to a 2x2 reconstruction because there's an even horizontal and vertical distance between the half-order and the full-order points in the corners of the pattern but I don't really understand how this is any different from a 4x4 or so.

On the Wikipedia page on LEED the following image is shown, representing the superposition of two different patterns, the 2x1, and the 1x2 patterns. These look identical to me apart from the direction of the drawn rectangle which thus far I have presumed to be a choice of the individual.

                                      enter image description here

Can these projections also indicate if such a surface is faceted? If so, how can this be deduced?

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  • $\begingroup$ I cant help answer, but I can point out your interpretation of the diagram from wikipedia is probably correct. They are the same, but its showing that you may have domains aligned differently, which superimpose to give the pattern in LEED. I think we have a few people that know LEED better than me around here though $\endgroup$
    – Tristan Maxson
    Jan 18 '21 at 15:54
  • $\begingroup$ Have you figured out the answer to this question yet? If you did, please write an answer since it will help future users who may have the same problem as you! $\endgroup$
    – Nike Dattani
    Aug 14 '21 at 17:44
  • $\begingroup$ Hi @user7077252, I see no interaction from you with the comments by Tristan and I, which were about 8 months apart. Would you mind if we treat this as an abandoned question? $\endgroup$
    – Nike Dattani
    Sep 5 '21 at 22:42
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    $\begingroup$ Hello Nike, I didn't find an answer to the question, but it is indeed no longer a subject of study of mine. Nonetheless, it has some votes, and I wonder if perhaps that means that it is a broad question that others are keen on knowing and therefore should not just be considered an abandoned question. It is completely up to you of course, I hope this question helps others by being answered of course. $\endgroup$
    – user7077252
    Sep 6 '21 at 15:38
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    $\begingroup$ @user7077252 I didn't see your reply to my comment! Without pinging me with the @ symbol, I won't get a notification that you replied. I do see the benefits of keeping this open, but also there's benefits of closing it, especially if this is no longer a subject of yours: specifically, the fewer questions we have in our unanswered queue, the more likely people can find questions that they can answer. It looks unlikely that this question will get an answer any time soon, but if someone does come along and wants to write an answer, they can comment and we'll reopen it! $\endgroup$
    – Nike Dattani
    Jan 13 at 0:45

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