Résumé : The structure and surface purity of epitaxial films of rhodium deposited by thermal evaporation and ion sputtering onto MgO(100), air cleaved and chemically polished, and onto epitaxial films of Cu(100) are compared. The orientation (100)d//(100)s (where d indicates deposit and s indicates substrate) is always predominant and only this orientation occurs on the (100)Cu//(100)MgO substrate. Electron diffraction and Auger spectroscopy show that the best results are obtained by glow discharge sputtering onto the last substrate. © 1986.