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Figure 16
General coherent twin for structures defined by hexagons generated by [{\bf e}_1], [{\bf e}_2] and [{\bf e}_3] with [|{\bf e}_1|] = [|{\bf e}_3|] = 1 and [|{\bf e}_2|] = [|{\bf e}_4|] = ρ. The angles α and β are defined as [({\bf e}_1,{\bf e}_3)] = 2α and [({\bf e}_1,{\bf e}_2)] = [\alpha + \beta]. The structure has the space group p2 whereas the [{\bb Z}]-module is the projection of the four-dimensional lattice of space group pmm.

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