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Doped holes in cuprates reside pairwise at lattice-defect O atoms but atdifferent sites in the two cuprate families. In the Sr-doped lanthanumcuprates, the O atoms occupy anion lattice sites and spread due to Coulombrepulsion (relative to the host lattice). In the oxygenated cuprates, the Oatoms occupy interstitial sites, hybridize to ozone complexes, and aggregate tostrings or (at high oxygenation) to nematic patches, always with spacing of ~3.25a_0. At the closing of the pseudogap at hole doping p*, a highly symmetricconfiguration of the O atoms appears in each family. In the first family itconsists of interlaced superlattices in the CuO_2 plane and each of thebracketing LaO layers, with spacing A_0^{LaO}(p*) = 2A_0^{CuO_2}(p*). In thesecond family it consists in the completion of a 2D superlattice of ozonecomplexes, with spacing A_0(p*) ~ 3.25a_0. Both cases are visualized.Implications for the bandstructure and strange-metal phase are considered.

Atomic configuration in cuprates at the closing of the pseudogap