Demo

You entered the OD groupoid family symbol: tp p11(2/a) { - - (-4^-)} [r,s]

The OD groupoid family parsed fine.

General OD Family Symbol

tpp11 (2/a)  
 --4+4
 4-4
 4+
 4-
  [r',1/2+s']   

Reduced general OD Family Symbol

tpp11 (2/a)  
 --4+4
 4-4
 4+
 4-
  [r',1/2+s']   

General Data

OD family of layers

Kinds of layers:N=1
Category:I (single)
Pointgroup:4/m (C4h)
Crystal system:tetragonal
Layer system:square
Common lattice:same
Common lattice size (rel. to global):1
Layer planes:(001)
c0(0,0,1)
Global lattice restriction:ab=0, |b|=|a|
User supplied lattice restriction:ab=0, |b|=|a|
Lattice restriction derived from layers:none

Layer Data

Layer 0:

Type:Layer group
Symbol:p11(2/a)
Crystal system:monoclinic
Layer system:oblique
Polarity:non-polar
Lattice restriction (instrinsic):none
Lattice restriction (extrinsic):ab=0, |b|=|a|
Lattice (rel. to global):same
Lattice (rel. to common):same
Lattice size (rel. to global):1
Lattice size (rel. to common):1
Order (modulo lattice):4
Order (modulo global lattice):4
Order (modulo common lattice):4
Floating origin:0,0,0

Symmetry operations:

x,y,z1
-x+1/2,-y,z2
x+1/2,y,-za
-x,-y,-z1

Special positions:

x,y,z
1/4,0,z
0,0,0

Centring vectors:

none

Special parameters

Special parameters for σ-POs (right)

  1. (general, reduced)
    Codes: general, reduced
    1. No subparameters.
  2. r'=r, s'=-1/2+s (user)
    Codes: user-1
    1. No subparameters.
  3. r'=1/4+m/2, s'=1/4+n/2, m,n∈ℤ (special)
    Codes: nfz1-2-2 (2 [001] 1/4,0,z)
    1. m=0, n=0
    2. m=1, n=0
    3. m=0, n=1
    4. m=1, n=1
  4. r'=1/4-m/2+n/2, s'=-1/4+m/2+n/2, m,n∈ℤ (special)
    Codes: nfz2-3-2 (4+ [001] 1/4+r'/2+s'/2,1/4-r'/2+s'/2,1/2), nfz2-4-2 (4- [001] r'/2-s'/2,r'/2+s'/2,1/2)
    1. m=0, n=0
    2. m=0, n=1