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Figure 2
The average structure of the high-Tc superconductor HBCO, drawn using the coordinates published by Bertinotti et al. (1996BB3). (a) A projection down [010], showing how the planar HgOδ layer is sandwiched between two Ba2CuO4 layers. (b) The HgOδ layer shown in projection down [001], showing the O3 interstitial site surrounded by four Hg atoms and sandwiched between Ba atoms in the layers below and above (not shown). The O3 site has an occupancy of δ.

IUCrJ
Volume 3| Part 5| September 2016| Pages 309-318
ISSN: 2052-2525
doi:10.1107/S2052252516010629