Empty lattice approximation for a hexagonal crystal
Γ
A
K
H
M
L
Γ
A
K
H
M
L
Γ
A
K
H
M
L
Γ
A
K
H
M
L
Γ
A
K
H
M
L
Γ
A
K
H
M
L
Γ
A
K
H
M
L
a/c
:
