  We consider a two-dimensional complex plasma layer containing charged dust
particles in a perpendicular magnetic field. Computer simulations of both
one-component and binary systems are used to explore the equilibrium particle
dynamics in the fluid state. The mobility is found to scale with the inverse of
the magnetic field strength (Bohm diffusion) for strong fields. For bidisperse
mixtures, the magnetic field dependence of the long-time mobility depends on
the particle species providing an external control of their mobility ratio. For
large magnetic fields, even a two-dimensional model porous matrix can be
realized composed by the almost immobilized high-charge particles which act as
obstacles for the mobile low-charge particles.
