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Figure 1
Schematic illustration of two-dimensional ferroelastic domains and their unit cells (2 × 2 supercells are shown). The middle image (marked by the letter C, standing for the two-dimensional prototype of `cubic') corresponds to the single-domain `parent' phase. The lattice basis vectors here are ai0 or, symmetry equivalently, [{\bf a}_{i0}^\prime]. The right and left images (marked by the letter R, standing for the two-dimensional prototype of `rhombohedral') correspond to the ferroelastic domains. The lattice basis vectors here (aim, m = 1…2) are chosen in such a way that aim are nearly parallel to ai0.

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ISSN: 2053-2733
Volume 78| Part 3| May 2022| Pages 158-171
https://doi.org/10.1107/S2053273322002534
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