International
Tables for
Crystallography
Volume C
Mathematical, physical and chemical tables
Edited by E. Prince

International Tables for Crystallography (2006). Vol. C, ch. 9.2, p. 768

Figure 9.2.2.9 

S. Ďuroviča
[Figure 9.2.2.9]
Figure 9.2.2.9

The nine possible displacements in the structures of polytypes of phyllosilicates. The individual vectors are designated by their conventional numerical characters and the signs +, −. The zero displacement <*> is not indicated. The relations of these vectors to the basis vectors a1, a2 or a, b are evident.