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Figure 10
Example of structures of symmetry [pm_{x}(\Lambda)] and [pg_{x}(\Lambda)], showing that the mirror of the exchange set survives in the bicrystal symmetry only for the rigid-body translation τ located at special positions of the group [{\cal W}_{\alpha} = pm_{y}] with translation group [{\cal U}_{\alpha}]. Beyond the general position (x,y) generating a bilayer of symmetry p1 and not shown here, there are two other strata (0,y) and (1/2,y) which generate a mirror in the bilayer structure. According to the values 0 or 1/2 of the x component of τ on [{\cal U}_{\alpha}], these mirrors are either pure or glide. Here [\rho = \sqrt{3/2} ], n = 1, m = 1, α = 101.537°; the coincidence lattice [{\cal T}_{\alpha}] is defined by [T_{1} = (1,1),\ T_{2} = (\bar{3},2)] with [\Sigma = 5].

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ISSN: 2053-2733
Volume 79| Part 4| July 2023| Pages 301-317
https://doi.org/10.1107/S2053273323003662
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