  We consider the effect of electron-electron interactions on the
current-in-plane (CIP) conductivity and exchange coupling energy of a
disordered metallic magnetic multilayer. We analyze its dependence on the value
of ferromagnetic splitting of conducting electrons and ferromagnetic layers
relative magnetizations orientation. We show that contribution to the CIP
conductivity and exchange coupling energy as a periodic function of the angle
of magnetizations relative orientation experience $ 2\pi \to \pi $ transition
depending on the characteristic energies: ferromagnetic splitting of the
conducting electrons and the Thouless energy of paramagnetic layer.
