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I have drawn three surface meshes from a hexagonal material for the $(0001)$, $(1\bar{1}00)$ and $(1\bar{1}01)$. The first one would be the top horizontal surface of the hexagonal structure, the second a vertical rectangular surface from one of the walls, and the third one would be a rectangle at an angle to intersect the c-axis.

But does this mean then that this last one is oblique because it is inclined to intersect the c-axis? How do I identify an oblique surface mesh?

The definition I have been given for an oblique surface mesh is that "it doesn't have a 90 degree angle between the basis vectors." but what are the basis vectors? Are there the $a_1, a_2,a_3, c$ vectors? If so, aren't these always the same independent on the surface of the crystal?

I believe that these meshes are rectangular but I am not entirely sure and would like to know if there are any sources I can check to learn the subject better.

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    $\begingroup$ Hi, it would be helpful if you could post images as well. $\endgroup$
    – Hitanshu Sachania
    Commented Nov 29, 2020 at 14:29
  • $\begingroup$ Unfortunately I do not have any, but I am basing my understanding it from an hexagonal structure shown in the following link : researchgate.net/profile/Sirona_Valdueza-Felip/publication/… $\endgroup$
    – user7077252
    Commented Nov 29, 2020 at 14:31
  • $\begingroup$ The surface is equal to the one present on te right hexagonal structure on figure 3.24 on chegg.com/homework-help/… $\endgroup$
    – user7077252
    Commented Nov 29, 2020 at 21:45
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    $\begingroup$ @HitanshuSachania Are the links provided by the user sufficient to help you try to answer the question? This question has gone unanswered for about 3 months and I'm trying to help shorten the unanswered queue! $\endgroup$
    – Nike Dattani - No Free Time
    Commented Feb 28, 2021 at 5:25
  • $\begingroup$ @NikeDattani sorry, don't have the expertise to answer this question. That was only a general suggestion. $\endgroup$
    – Hitanshu Sachania
    Commented Feb 28, 2021 at 18:12

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