Sr2CuO2Cl2. represents a virtually great scenario of a 2-D antiferromagnetic CuO2-plane and so is of unique curiosity within the context from the origins of high TC superconductivity. We've got calculated experimentally and analyzed theoretically the Ti 2p X-ray photoemission spectra (XPS) and the resonant enhancement of valence photoemissionat the Ti https://okada4dsg.com/