Table 1. Group–subgroup data for the Pmc21 → Pbn21 transition.
| K vectors | Irreps and order parameters | Isotropy subgroup |
|---|---|---|
| GM: (0, 0, 0) | GM1: (a) | Pmc21 |
| X: (1/2, 0, 0) | X 2: (a) | Pmn21 |
| Y: (0, 1/2, 0) | Y 2: (a) | Pbc21 |
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