Demo

You entered the OD groupoid family symbol: c21(1) { - n_(2,r) (n_(r,s))}

The OD groupoid family parsed fine.

General OD Family Symbol

c21 (1)  
-n2,r'nr',s'
n2,1+r'n1+r',1+s'

Reduced general OD Family Symbol

c21 (1)  
-n2,r'nr',s'
n2,1+r'n1+r',1+s'

General Data

OD family of layers

Kinds of layers:N=1
Category:I (single)
Pointgroup:2mm (C2v)
Crystal system:orthorhombic
Layer system:rectangular
Common lattice:same
Common lattice size (rel. to global):1
Layer planes:(001)
c0(0,0,1)
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, reduced)
    Codes: general, reduced
    1. No subparameters.
  2. r'=r+l'+l'', s'=s+l'-l'', l',l''∈ℤ (user)
    Codes: user-1, user-2, user-3, user-4
    1. l'=0, l''=0
  3. r'=m/2+n/2, s'=m/2-n/2, m,n∈ℤ (special)
    Codes: nfz2-2-1 (nr',s' [001] x,y,1/2)
    1. m=0, n=0
    2. m=1, n=0
    3. m=0, n=1
    4. m=1, n=1