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Figure 3
Schematic representation of the prototype (58°, a + 2b) stretch twin. (a) Supercell OX2YG chosen for the calculations. (b) Projection along the OY = a + 2b axis, showing that after a (58°, a + 2b) rotation the two supercells nearly overlap; the supercell of the parent h.c.p. cell (in blue) can be transformed into the supercell of the twin (in red) by a stretch distortion represented by the green arrows. This twinning mode establishes a correspondence between the basal plane and the [ ({2\bar 12} )] plane. Obliquity corrections are possible to build conventional (shear) twins from the prototype twin, which maintain untilted an undistorted plane; the two possible planes are (c) [ ({\bar 212} )] and (d) [ ({2\bar 16} )].

Journal logoJOURNAL OF
APPLIED
CRYSTALLOGRAPHY
ISSN: 1600-5767
Volume 51| Part 3| June 2018| Pages 809-817
https://doi.org/10.1107/S1600576718005678
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