Sr2CuO2Cl2. signifies a virtually ideal circumstance of a two-D antiferromagnetic CuO2-plane and so is of specific curiosity from the context of the origins of higher TC superconductivity. Now we have calculated experimentally and analyzed theoretically the Ti 2p X-ray photoemission spectra (XPS) as well as resonant enhancement of valence photoemissionat https://okada4dsg.com/