Sr2CuO2Cl2. Signifies a virtually suitable scenario of the 2-D antiferromagnetic CuO2-plane and thus is of certain curiosity in the context from the origins of large TC superconductivity. We have calculated experimentally and analyzed theoretically the Ti 2p X-ray photoemission spectra (XPS) along with the resonant improvement of valence photoemissionat the https://okada4dsg.com/