p2mg 2mm Rectangularinfo
No. 7 p2mg Patterson symmetry p2mm

symmetry group diagram

Origin at 2 1 g

Asymmetric unit 0 ≤ x ≤ 1/4; 0 ≤ y ≤ 1

Symmetry operations

(1)  1   (2)  2   0, 0(3)  m   1/4y(4)  a   x, 0

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

Positions

Multiplicity, Wyckoff letter,
Site symmetry
Coordinates Reflection conditions

 General:
4 d 1
(1) xy(2) -x-y(3) -x + 1/2y(4) x + 1/2-y
h0: h = 2n
    Special: as above, plus
2 c  . m . 
1/4y 3/4-y
no extra conditions
2 b  2 . . 
0, 1/2 1/21/2
hk: h = 2n
2 a  2 . . 
0, 0 1/2, 0
hk: h = 2n








































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