In supersymmetric models R-parity can be violated through either bilinear or
trilinear terms in the superpotential, or both. If charged scalar leptons are
the lightest supersymmetric particles, their decay properties can be used to
obtain information about the relative importance of these couplings. We show
that in some specific scenarios it is even possible to decide whether bilinear
or trilinear terms give the dominant contribution to the neutrino mass matrix.Comment: Intro rewritten, Fig 1 and Fig 4 slightly changed, conclusions
unchanged, 25 pages, 4 figure
