Demo
You entered the OD groupoid family symbol: pm2_1(n) { 2_(-1+r) n_(2,r) (2_2)} [-,-1/2+s]
The OD groupoid family parsed fine.
General OD Family Symbol
| p | m | 21 | | (n) | | |
| { | 2-1+r' | n2,r' | ( | 22 | ) | } |
| | [-1/2+s'] | | | |
Reduced general OD Family Symbol
| p | m | 21 | | (n) | | |
| { | 2-1+r' | n2,r' | ( | 22 | ) | } |
| | [-1/2] | | | |
General Data
OD family of layers
| Kinds of layers: | N=1 |
| Category: | I (single) |
| Pointgroup: | mmm (D2h) |
| 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: | pm21(n) |
| Crystal system: | orthorhombic |
| 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: | 0,y,z |
Symmetry operations:
| x,y,z | 1 |
| -x,y,z | m |
| -x+1/2,y+1/2,-z | 21 |
| x+1/2,y+1/2,-z | n |
Special positions:
x,y,z
0,y,z
Centring vectors:
none
Special parameters