pm m Rectangularinfo
No. 3 p1m1 Patterson symmetry p2mm

symmetry group diagram

Origin on m

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

Symmetry operations

(1)  1   (2)  m   0, y

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

Positions

Multiplicity, Wyckoff letter,
Site symmetry		 Coordinates Reflection conditions
 General:
2 c 1
(1) x, y(2) -x, y
no conditions
    Special: as above, plus
1 b  . m . 
1/2, y
no extra conditions
1 a  . m . 
0, y
no extra conditions

Maximal non-isomorphic subgroups

I[2] p1 (1)1
IIa none
IIb[2] pg (b' = 2b) (4); [2] cm (a' = 2a, b' = 2b) (5)

Maximal isomorphic subgroups of lowest index

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

Minimal non-isomorphic supergroups

I[2] p2mm (6); [2] p2mg (7)
II[2] cm (5)








































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