Sr2CuO2Cl2. represents a nearly suitable case of the two-D antiferromagnetic CuO2-airplane and so is of unique desire while in the context with the origins of superior TC superconductivity. We've calculated experimentally and analyzed theoretically the Ti 2p X-ray photoemission spectra (XPS) plus the resonant improvement of valence photoemissionat the Ti https://okada4dsg.com/