# Demo

You entered the OD groupoid family symbol: p2/b1(1) { 2_r/n_(1,2) -1 (-1)}

The OD groupoid family parsed fine.

## General OD Family Symbol

*p* | 2/*b* | 1 | | (1) | | |

{ | 2_{r'}/*c*_{2} | 1 | ( | 1 | ) | } |

## Reduced general OD Family Symbol

*p* | 2/*b* | 1 | | (1) | | |

{ | 2_{r'}/*c*_{2} | 1 | ( | 1 | ) | } |

## General Data

### OD family of layers

Kinds of layers: | *N*=1 |

Category: | I (single) |

Pointgroup: | 2/*m*11 (*C*_{2h}) |

Crystal system: | monoclinic |

Layer system: | rectangular |

Common lattice: | same |

Common lattice size (rel. to global): | 1 |

Layer planes: | (001) |

**c**_{0} | (0,*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: | *p*2/*b*1(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: | 0,0,0 |

#### Symmetry operations:

*x*,*y*,*z* | 1 |

*x*,-*y*+1/2,-*z* | 2 |

-*x*,*y*+1/2,*z* | *b* |

-*x*,-*y*,-*z* | 1 |

#### Special positions:

x,y,z

x,1/4,0

0,0,0

#### Centring vectors:

none

## Special parameters