We report the results of theoretical calculations of copper K-edge x-ray-absorption near-edge spectra (XANES) in

{La}_{2}

{CuO}_{4}

and related oxides

{Cu}_{2}

O, CuO, and

{KCuO}_{2}

. The final bound states were obtained from the self-consistent-field discrete-variational Xα method (SCF DV Xα), and continuum states were found by the multiple-scattering method using the muffin-tin truncation of the SCF DV Xα potentials. Composition of the final-state wave functions was analyzed. The 1s ionization potentials of the three reference compounds obtained from the SCF DV Xα transition-state calculations were used to set up the relative energy scale for the calculated cross section. The principal features of measured Cu K-edge XANES for

{Cu}_{2}

O, CuO, and

{KCuO}_{2}

were reproduced satisfactorily by our calculations along with their relative energy positions. Our calculated polarized XANES of

{La}_{2}

{CuO}_{4}

were compared with measured spectra, and two shakeup features were identified with radiation polarized along the crystal c axis. By quantitatively comparing the measured spectra with a model based on our calculated cross sections, their intensities were found to be ∼24% and 10% of the main transition with shakeup energies of 5.7 and 9.5 eV, respectively. We suggest that these multielectron excitation features involve Cu 3d→4p transitions.

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