pg m Rectangularinfo
No. 4 p1g1 Patterson symmetry p2mm

symmetry group diagram

Origin on g

Asymmetric unit 0 ≤ x ≤ 1/2; 0 ≤ y ≤ 1

Symmetry operations

(1)  1   (2)  b   0, y

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

Positions

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

Maximal non-isomorphic subgroups

I[2] p1 (1)1
IIa none
IIbnone

Maximal isomorphic subgroups of lowest index

IIc[2] pg (a' = 2a) (4); [3] pg (b' = 3b) (4)

Minimal non-isomorphic supergroups

I[2] p2mg (7); [2] p2gg (8)
II[2] cm (5); [2] pm(b' = 1/2b) (3)








































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