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Figure 8
Bilayer of structure p4gm for the rotation δ = 18.435° with coincidence lattice [(2,1),(-1,2)] 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}]; 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.

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ISSN: 2053-2733
Volume 81| Part 2| March 2025|
https://doi.org/10.1107/S2053273324012087
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