Cimetidine, C10H16N6S, form C: crystal structure and modelling of polytypes using the superspace approach

Arakcheeva, A.; Pattison, P.; Bauer-Brandl, A.; Birkedal, H.; Chapuis, G.

doi:10.1107/S0021889812048133

Figure 6
Scheme illustrating the different sequence of L and L' along the a axis as a function of the modulation vector q = [alpha]

(a')* and t₀. The sequence can be deduced from the intersections of a black solid line with black (L') and grey (L) (orange in the electronic version of the journal) domains. The L domain is defined by the central point x₄ = 0 and width [Delta]

= 0.5. L and L' domains are related by the unit-cell centring X = 0 $[\textstyle{1 \over 2}]$ 0 $[\textstyle{1 \over 2}]$ . The coefficient [alpha]

in the q vector expression is equal to the tangent of the angle between the black solid line and the x₁ axis.