  We propose two kinds of wire configurations fabricated on an atom chip
surface for creating two-dimensional (2D) adiabatic rf guide with an
inhomogeneous rf magnetic field and a homogenous dc magnetic field. The guiding
state can be selected by changing the detuning between the frequency of rf
magnetic field and the resonance frequency of two Zeeman sublevels. We also
discuss the optimization of loading efficiency and the trap depth and how to
decide proper construction when designing an rf atom chip.
