Sr2CuO2Cl2. Signifies a nearly suitable situation of a two-D antiferromagnetic CuO2-aircraft and thus is of distinct fascination from the context of the origins of significant TC superconductivity. We have calculated experimentally and analyzed theoretically the Ti 2p X-ray photoemission spectra (XPS) and the resonant improvement of valence photoemissionat the Ti https://okada4dsg.com/