p2mm 2mm Rectangularinfo
No. 6 p2mm Patterson symmetry p2mm

symmetry group diagram

Origin at 2 m m

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

Symmetry operations

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

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

Positions

Multiplicity, Wyckoff letter,
Site symmetry
Coordinates Reflection conditions

 General:
4 i 1
(1) xy(2) -x-y(3) -xy(4) x-y
no conditions
    Special: as above, plus
2 h  . m . 
1/2y 1/2-y
no extra conditions
2 g  . m . 
0, y 0, -y
no extra conditions
2 f  . . m 
x1/2 -x1/2
no extra conditions
2 e  . . m 
x, 0 -x, 0
no extra conditions
1 d  2 m m 
1/21/2
no extra conditions
1 c  2 m m 
1/2, 0
no extra conditions
1 b  2 m m 
0, 1/2
no extra conditions
1 a  2 m m 
0, 0
no extra conditions








































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