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Figure 8
For the simple case of p = 3, coherent twins are generated by exchanging two symbols in the vector of free edges while leaving the third one constant. Here is the example of the 8-gon (1,2,2) structure in (a) and 9-gon (1,2,3) in (b). Because of its own symmetry the 8-gon structure allows for two exchanges only, [(2,\underline{2},1)], the mirror in blue, and [(2,1,\underline{2})], the mirror in orange. The 9-gon (1,2,3) allows for one additional exchange [(\underline{1},3,2)] characterized by the mirror 3 in green. In all cases, the twin interfaces are generated by the glide mirrors drawn in dashed lines, perpendicular to the previous ones.

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ISSN: 2053-2733
Volume 72| Part 1| January 2016| Pages 55-61
doi:10.1107/S2053273315018197
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