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Figure 5
Proposed ordering of Cu atoms in a superstructure. The figure shows one c.p. layer where the copper atoms are disordered in the average structure [(a) and (c)] and the proposed superstructure [(b) and (d)]. (a) and (b) shows the ab-plane for disordered and ordered copper sites, respectively. In (c) and (d) the structure is seen from the top along the c-axis for disordered and ordered copper sites, respectively. Se (grey), Cu1a (blue), Cu1b (red) and Cu2 (green). The orange bond illustrates the unphysical short Cu1b—Cu2 contact.

IUCrJ
Volume 4| Part 4| July 2017| Pages 476-485
ISSN: 2052-2525
https://doi.org/10.1107/S2052252517005553