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We present results for realistic modeling of the x-ray absorption near edgestructure (XANES) of the overdoped high-T_c superconductor La_2-xSr_xCuO_4 inthe hole doping range x = 0.20-0.30. Our computations are based on a real-spaceGreen's function approach in which strong-correlation effects are taken intoaccount in terms of a doping-dependent self-energy. The predicted O K-edgeXANES is found to be in good accord with the corresponding experimental resultsin this overdoped regime. We find that the low energy spectra are dominated bythe contribution of O-atoms in the cuprate planes, with little contributionfrom apical O-atoms.

X-ray absorption near-edge spectra of overdoped La_2-xSr_xCuO_4 high-T_c superconductors