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p2gg 2mm Rectangular
No. 8 p2gg Patterson symmetry p2mm

Plane-group diagrams: a projection of the symmetry elements and a diagram showing a set of equivalent points in the general position

Origin at 2

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

Symmetry operations

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

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

Positions

Multiplicity, Wyckoff letter,
Site symmetry		 Coordinates Reflection conditions
 General:
4 c 1
(1) x, y(2) -x, -y(3) -x + 1/2, y + 1/2(4) x + 1/2, -y + 1/2
h0: h = 2n
0k: k = 2n
    Special: as above, plus
2 b  2 . . 
1/2, 0 0, 1/2
hk: h + k = 2n
2 a  2 . . 
0, 0 1/2, 1/2
hk: h + k = 2n








































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