Sr2CuO2Cl2. represents a nearly perfect situation of a 2-D antiferromagnetic CuO2-airplane and so is of particular curiosity while in the context on the origins of large TC superconductivity. We've got measured experimentally and analyzed theoretically the Ti 2p X-ray photoemission spectra (XPS) as well as the resonant improvement of valence https://okada4dsg.com/