Origin on glide plane a

Asymmetric unit

0 ≤ x ≤ 1; 0 ≤ y ≤ 1; 0 ≤ z

(1)  1

(2)  a   x, y, 0

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

Positions

Multiplicity, Wyckoff letter, Site symmetry	Coordinates	Reflection conditions
		General:
2 a 1	(1) x, y, z (2) x + 1/2, y, -z	hk: h = 2n h0: h = 2n

Symmetry of special projections

Along [001]   p1 a' = 1/2a   b' = b    Origin at 0, 0, z

Along [100]   11m a' = bp    Origin at x, 0, 0

Along [010]   11g a' = ap    Origin at 0, y, 0

Maximal non-isotypic subgroups

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I

[2] p1 (1)

1

IIa

none

IIb

none

Maximal isotypic subgroups of lowest index

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IIc	[2] p11a (b' = 2b or a' = a + 2b, b' = 2b) (5)

Minimal non-isotypic supergroups

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I	[2] p112/a (7); [2] pm21b (28); [2] pb2b (30); [2] pm2a (31); [2] pm21n (32); [2] pb21a (33); [2] pb2n (34); [2] cm2e (36)

II	[2] p11m (a' = 1/2a) (4)

DIFFERENT CELL CHOICES

p11a

CELL CHOICE 1

Origin on glide plane a

Asymmetric unit

0 ≤ x ≤ 1; 0 ≤ y ≤ 1; 0 ≤ z

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

Positions

Multiplicity, Wyckoff letter, Site symmetry	Coordinates	Reflection conditions
		General:
2 a 1	(1) x, y, z (2) x + 1/2, y, -z	hk: h = 2n h0: h = 2n

p11n

CELL CHOICE 2

Origin on glide plane n

Asymmetric unit

0 ≤ x ≤ 1; 0 ≤ y ≤ 1; 0 ≤ z

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

Positions

Multiplicity, Wyckoff letter, Site symmetry	Coordinates	Reflection conditions
		General:
2 a 1	(1) x, y, z (2) x + 1/2, y + 1/2, -z	hk: h + k = 2n h0: h = 2n 0k: k = 2n

p11b

CELL CHOICE 3

Origin on glide plane b

Asymmetric unit

0 ≤ x ≤ 1; 0 ≤ y ≤ 1; 0 ≤ z

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

Positions

Multiplicity, Wyckoff letter, Site symmetry	Coordinates	Reflection conditions
		General:
2 a 1	(1) x, y, z (2) x, y + 1/2, -z	hk: k = 2n 0k: k = 2n

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