International
Tables for
Crystallography
Volume B
Reciprocal space
Edited by U. Shmueli

International Tables for Crystallography (2006). Vol. B, ch. 4.4, p. 463   | 1 | 2 |

Figure 4.4.5.1 

P. S. Pershana*

aDivision of Engineering and Applied Science and The Physics Department, Harvard University, Cambridge, MA 02138, USA
Correspondence e-mail: pershan@deas.harvard.edu

[Figure 4.4.5.1]
Figure 4.4.5.1

Schematic illustration of the molecular stacking for the discotic (a) [D_{2}] and (b) [D_{1}] phases. In neither of these two phases is there any indication of long-range positional order along the columns. The hexagonal symmetry of the [D_{1}] phase is broken by `herringbone-like' correlations in the molecular tilt from column to column.