Origin at centre (2/m)

Asymmetric unit

0 ≤ x ≤ 1/2; 0 ≤ y ≤ 1/2

(1)  1

(2)  2   x, 0, 0

(3)  -1   0, 0, 0

(4)  m   0, y, z

Generators selected (1); t(1, 0, 0); t(0, 1, 0); (2); (3)

Positions

Multiplicity, Wyckoff letter, Site symmetry	Coordinates	Reflection conditions
		General:
4 i 1	(1) x, y, z (2) x, -y, -z (3) -x, -y, -z (4) -x, y, z	no conditions

		Special: no extra conditions
2 h  m	1/2, y, z 1/2, -y, -z
2 g  m	0, y, z 0, -y, -z
2 f  2	x, 1/2, 0 -x, 1/2, 0
2 e  2	x, 0, 0 -x, 0, 0
1 d  2/m	1/2, 1/2, 0
1 c  2/m	0, 1/2, 0
1 b  2/m	1/2, 0, 0
1 a  2/m	0, 0, 0

Symmetry of special projections

Along [001]   p2mm a' = a   b' = bp    Origin at 0, 0, z

Along [100]   211 a' = b    Origin at x, 0, 0

Along [010]   2mm a' = a    Origin at 0, y, 0

Maximal non-isotypic subgroups

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I	[2] pm11 (11)	1; 4
	[2] p211 (8)	1; 2
	[2] p-1 (2)	1; 3

IIa

none

IIb	[2] c2/m11 (a' = 2a, b' = 2b) (18); [2] p2/b11 (b' = 2b) (16); [2] p21/m11 (a' = 2a) (15)

Maximal isotypic subgroups of lowest index

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IIc	[2] p2/m11 (a' = 2a) (14); [2] p2/m11 (b' = 2b) (14)

Minimal non-isotypic supergroups

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I	[2] pmmm (37); [2] pmaa (38); [2] pmma (41); [2] pman (42)

II	[2] c2/m11 (18)

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