You entered the OD groupoid family symbol: pb2_1(a) { n_(1+s,2) 2_(1+s) (n_(1+r,s))}

The OD groupoid family parsed fine.

General OD Family Symbol

pb21 (a)  

Reduced general OD Family Symbol

pb21 (a)  

General Data

OD family of layers

Kinds of layers:N=1
Category:I (single)
Pointgroup:m2m (C2v)
Crystal system:orthorhombic
Layer system:rectangular
Common lattice:same
Common lattice size (rel. to global):1
Layer planes:(001)
Global lattice restriction:ab=0
User supplied lattice restriction:none
Lattice restriction derived from layers:ab=0

Layer Data

Layer 0:

Type:Layer group
Crystal system:orthorhombic
Layer system:rectangular
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:0,y,z

Symmetry operations:


Special positions:


Centring vectors:


Special parameters

Special parameters for σ-POs (right)

  1. (general, reduced)
    Codes: general, reduced
    1. No subparameters.
  2. r'=1+r+2l'', s'=s+2l''', l'',l'''∈ℤ (user)
    Codes: user-1
    1. l''=0, l'''=0
  3. r'=m, m∈ℤ (special)
    Codes: nfz1-2-2 (b [100] 0,y,z)
    1. m=0
    2. m=1
  4. s'=n, n∈ℤ (special)
    Codes: nfz2-3-1 (21+s' [010] r'/4,y,1/2)
    1. n=0
    2. n=1
  5. r'=m, s'=n, m,n∈ℤ (special)
    Codes: nfz2-4-1 (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