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![[Figure 2]](fg1830fig2mag.jpg)
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Figure 2
A view of the unit cell along the crystallographic b axis. The approximate molecular C2 axis is oriented perpendicular to the direct b and c axes and parallel to the reciprocal a* axis. The twin cell, marked in dashed lines and labeled with primes, is generated by a twofold rotation about a*. A primitive supercell containing both unit cells (shaded in grey) is obtained by a doubling of the a axis. This primitive supercell is monoclinic and can be transformed into a B-centred pseudo-orthorhombic cell (drawn in thick lines and labeled with double primes), where the original twin axes along a* and c are now part of the lattice. |
![[Figure 2]](fg1830fig2.jpg)
 | STRUCTURAL CHEMISTRY |
ISSN: 2053-2296
