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Acta Crystallographica Section A Acta Crystallographica Section A FOUNDATIONS AND ADVANCES |
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![[Figure 8]](/a/issues/2025/02/00/uv5030/uv5030fig8mag.jpg)
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| Figure 8 Bilayer of structure p4gm for the rotation δ = 18.435° with coincidence lattice ![[(2,1),(-1,2)]](https://journals.iucr.org/10.1107/S2053273324012087/teximages/uv5030fi353.svg){kind=small} of the unit cell in yellow on the moiré patterns. On the left, the straight lines
Δ in black are the traces of the mirrors m and ![[m^{\prime}]](https://journals.iucr.org/10.1107/S2053273324012087/teximages/uv5030fi354.svg){kind=small} ; the lattice of L2 is displaced by the non-primitive translation t = (1/2, 1/2) associated to the mirrors in p4gm. For τ = (0, 0), the Δ lines hit lattice nodes along the diagonal directions generating pure mirrors along
these directions for a bilayer symmetry p4gm. For τ = (1/2, 0), they hit lattice nodes only in the y direction which generates a set of mirrors along the x direction for a bilayer symmetry pmx. For τ = (1/2, 1/2) they hit lattice nodes on all mirror directions of the square for a
bilayer symmetry p4mm. In blue, on the right column, the zero locus. |
![[Figure 8]](https://journals.iucr.org/10.1107/S2053273324012087/uv5030fig8.jpg)
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FOUNDATIONS ADVANCES |
ISSN: 2053-2733
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