Point Group C
2h
Quaternary direct products
A
g
⊙A
g
⊙
⊙
A
g
B
g
A
u
B
u
A
g
A
g
B
g
B
g
A
g
A
u
A
u
B
u
A
g
B
u
B
u
A
u
B
g
A
g
A
g
⊙B
g
⊙
⊙
B
g
A
u
B
u
B
g
B
g
A
u
A
u
B
g
B
u
B
u
A
g
B
g
A
g
⊙A
u
⊙
⊙
A
u
B
u
A
u
A
u
B
u
B
u
A
u
A
g
⊙B
u
⊙
⊙
B
u
B
u
B
u
B
g
⊙B
g
⊙
⊙
B
g
A
u
B
u
B
g
A
g
A
u
B
u
A
g
B
u
A
u
B
g
A
g
B
g
⊙A
u
⊙
⊙
A
u
B
u
A
u
B
u
B
u
A
u
B
u
B
g
⊙B
u
⊙
⊙
B
u
B
u
A
u
A
u
⊙A
u
⊙
⊙
A
u
B
u
A
u
A
g
B
u
B
g
A
g
A
u
⊙B
u
⊙
⊙
B
u
B
u
B
g
B
u
⊙B
u
⊙
⊙
B
u
B
u
A
g