Spectroscopic study of interfaces in Al/Ni periodic multilayers K. Le Guen, G. Gamblin, P. Jonnard, M. Salou, J. Ben Youssef, S. Rioual and B. Rouvellou Eur. Phys. J. Appl. Phys., 45 2 (2009) 20502 Published online: 31 January 2009 DOI: 10.1051/epjap/2008189