Sr2CuO2Cl2. Signifies a virtually perfect situation of the 2-D antiferromagnetic CuO2-airplane and so is of individual curiosity while in the context of your origins of higher TC superconductivity. We've 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/