  We investigate theoretically the resonant splitting of ballistic conductance
peaks in magnetic superlattices. It is found that, for magnetic superlattices
with periodically arranged $n$ identical magnetic-barriers, there exists a
general $(n-1)$-fold resonant peak splitting rule for ballistic conductance,
which is the analogy of the $(n-1)$-fold resonant splitting for transmission in
$n$-barrier electric superlattices (R. Tsu and L. Esaki, Appl. Phys. Lett. {\bf
22}, 562 (1973)).
