  We calculate the x-ray absorption near edge structure (XANES) modulating the
Ba 4d-photoabsorption cross section - the giant dipole resonance - centered
around 110 eV photon energy for several models of spherical and non-spherical
Ba@C_n metallofullerene cage systems. In the cases considered, the XANES
interference patterns provide clear structural "fingerprints", distinguishing
between center versus off-center Ba position and spherical versus deformed C_n
shell.
