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Figure 8
Twin domain unit cells for twins of modulus m = 16 with an axial ratio of a/b ≃ 0.2. Shown from top to bottom are the cases μ = 1 to μ = 6. The radius of the nodes is adjusted according to the minimal distance between closest nodes. Intraspiral contacts occur up to μ = 3 inclusive, while (partial) interspiral contacts prevail afterwards. Green nodes are symmetric under both a vertical and horizontal mirror plane, with unit cells containing only green nodes belonging to plane-group type c2mm (No. 9), while red ones are only symmetric under a horizontal one, with all unit cells containing them belonging to plane-group type cm (No. 5). A chevron motif 〉〈 resembling the arrangement of the green nodes is overlaid for the case μ = 1, together with the outlined parallel (intraspiral) and perpendicular (interspiral) vectors (blue) used in its definition (Fig. 2[link]).

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ISSN: 2053-2733
Volume 79| Part 6| November 2023| Pages 570-586
https://doi.org/10.1107/S2053273323008276
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