International
Tables for
Crystallography
Volume A
Space-group symmetry
Edited by M. I. Aroyo

International Tables for Crystallography (2016). Vol. A, ch. 2.1, p. 166

Table 2.1.3.8 

Th. Hahna and A. Looijenga-Vosb

Table 2.1.3.8| top | pdf |
Reflection conditions for the plane groups

Type of reflectionsReflection conditionCentring type of plane cell; or glide line with glide vectorCoordinate system to which condition applies
hk None Primitive p All systems
[h + k = 2n] Centred c Rectangular
[h - k = 3n] Hexagonally centred h Hexagonal
h0 [h = 2n] Glide line g normal to b axis; glide vector [{1 \over 2}{\bf a}] [\left.\matrix{\noalign{\vskip 50pt}}\right\}\matrix{\hbox{Rectangular, }\hfill\cr\quad\hbox{Square}\hfill}]
0k [k = 2n] Glide line g normal to a axis; glide vector [{1 \over 2}{\bf b}]
For the use of the unconventional h cell see Table 2.1.1.2[link].