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Figure 2
The crystal structure of β-Cu2−xSe. (a) The full unit cell is shown with the copper-rich layers highlighted by purple tetrahedra. (b) The structure oriented in the ab-plane is shown to the right. Color codes for the atoms are: Cu1a (blue), Cu1b (red), Cu2 (green) and Se (grey).

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