Empty lattice approximation for a tetragonal crystal
Γ
X
M
A
R
Z
Γ
X
M
A
R
Z
Γ
X
M
A
R
Z
Γ
X
M
A
R
Z
Γ
X
M
A
R
Z
Γ
X
M
A
R
Z
Γ
X
M
A
R
Z
a/c
:
