Sr2CuO2Cl2. Represents an almost best case of a 2-D antiferromagnetic CuO2-plane and so is of specific interest in the context on the origins of substantial TC superconductivity. Now we have calculated experimentally and analyzed theoretically the Ti 2p X-ray photoemission spectra (XPS) plus the resonant enhancement of valence photoemissionat the https://okada4dsg.com/