Demo

You entered the OD groupoid family symbol: c21(1) { c_2 -1 (-1)} [0,-]

The OD groupoid family parsed fine.

General OD Family Symbol

c21 (1)  
c211
n1,2
 [0]    

Reduced general OD Family Symbol

c21 (1)  
c211
n1,2
 [0]    

This OD subfamily is fully ordered and equivalent to

Pb'=-a/2+b/2,c'=2c2/c11

General Data

OD family of layers

Kinds of layers:N=1
Category:I (single)
Pointgroup:2/m11 (C2h)
Crystal system:monoclinic
Layer system:rectangular
Common lattice:same
Common lattice size (rel. to global):1
Layer planes:(001)
c0(r,s/2,1)
Global lattice restriction:ab=0
User supplied lattice restriction:none
Lattice restriction derived from layers:ab=0

Layer Data

Layer 0:

Type:Layer group
Symbol:c21(1)
Crystal system:monoclinic
Layer system:rectangular
Polarity:non-polar
Lattice restriction (instrinsic):ab=0
Lattice restriction (extrinsic):ab=0
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:x,0,0

Symmetry operations:

x,y,z1
x,-y,-z2
x+1/2,y+1/2,ztC
x+1/2,-y+1/2,-z21

Special positions:

x,y,z
x,0,0

Centring vectors:

(1/2,1/2,0)

Special parameters

Special parameters for σ-POs (right)

  1. (general)
    Codes: general
    1. No subparameters.
  2. r=0 (reduced)
    Codes: reduced
    1. No subparameters.
  3. r=0, s=l, l∈ℤ (user)
    Codes: user-1, user-2
    1. l=0
    2. l=1