Sr2CuO2Cl2. represents an almost best circumstance of a two-D antiferromagnetic CuO2-aircraft and thus is of unique interest during the context from the origins of higher TC superconductivity. We've calculated experimentally and analyzed theoretically the Ti 2p X-ray photoemission spectra (XPS) along with the resonant improvement of valence photoemissionat the Ti https://okada4dsg.com/