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When 2D compounds have a dipole, the potential distribution becomes linear (the left panel of the figure). After considering the dipole correction, the potential has two plateau regions in the vacuum (the right panel of the figure), rather than one. How can we determine the vacuum potential from the potential distribution curve? Physically speaking, we can either use the right- or left-side vacuum potential, or average them?

point.1, 2, 47 & 48 are different configurations of the same material with some thermal distortions

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