Table 1. Summary of the twinning matrices for all 12 monoclinic domains and the form of the reciprocal orientation matrices.

Arrows indicate the polarization rotation direction induced by an [001]-oriented electric field.

D	Polarization rotation plane and rotation angle	Twinning matrix, T	Form of the matrix	{004} reflection position XY
M 11	[111] → [001], ρ1
M 12	[111] ← [100], ρ2
M 13	[111] ← [010], ρ2
M 21
M 22
M 23
M 31
M 32
M 33
M 41
M 42
M 43