We present a closed expression for the muon longitudinal field relaxation f
unction which interpolates between the concentrated and the dilute spin gla
ss function, originally introduced by Uemura et al. (Phys. Rev. B 31 (1985)
546.) A fast computational algorithm for a data-fitting routine is outline
d and an application to an unconventional disordered magnetic system is poi
nted out. (C) 2000 Published by Elsevier Science B.V. All rights reserved.