  In the scenario of the electroweak baryogenesis we consider the dynamics of
fermions with a spatially varying mass in presence of a CP-violating bubble
wall and a uniform magnetic field perpendicular to the wall. The relevant
quantity for baryogenesis, $R_{R \to L} - R_{L \to R}$, is studied ($R_{R \to
L}$ and $R_{L \to R}$ being the reflection coefficients for right-handed and
left-handed chiral fermions, respectively).
