A study of the exchange coupling of Co/Rh/Co sandwiches grown by ultrahigh-vacuum evaporation on mica substrata is presented. In these sandwiches, both Co and Rh layers have a (111) fcc structure, as indicated by the RHEED pattern observed during growth. Oscillatory indirect exchange coupling and magnetoresistance as a function of the Rh thickness a observed. The most interesting result is the very strong antiferromagnetic exchange coupling reached for thin Rh space layers: 34 erg/cm 2 for 4.8 Å Rh. We attribute this result partly to the nature of the magnetic/non-magnetic interfaces shown by magnetisation measurements. Indeed, no reduction in the Co moment is found for these sandwiches although the is a large interdiffusion is expected at their interfaces. This is confirmed by ab initio calculations of the magnetisation with mixed interfaces. Such a magnetic nature of the interfaces should be favourable for electronic confinement in the space layer.