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Figure 8
The translation boundaries of the bean structure associated with (a) [R_1 = w_2-w_1 = (0,1,{\overline 1},0,0)], (b) [R_2 = w_3-w_1 = (1,0,{\overline 1},0,0)], (c) [R_3 = w_3-w_2 = (1,{\overline 1},0,0,0)]; in all three cases, one (in red) over the three translation orbits is invariant on crossing the boundary. (d) The unique translation boundary of the honeycomb structure [R = w_2 - w_1 = (0,0,1,{\overline 1},0) = (0,2-\tau)]. See Fig. 7[link] for the references of the translation orbits in [{\bf E}_\perp]. (e)–(f) Example of the translation [{\bf R} = (0,{\overline 1},1,0,0)] that can be achieved by introducing a microtwin: the microtwin is realized by successive application of a twin operation and its inverse displaced by [{\bf R}]: on (e) it is a rotation h of [\pi/10] followed by its opposite [-\pi/10] and on (f) it is a mirror applied twice.

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ISSN: 2053-2733
Volume 73| Part 6| November 2017| Pages 427-437
https://doi.org/10.1107/S2053273317013882
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