  We build on existing calculations of the wall velocity of the expanding
bubbles of the broken symmetry phase in a first-order electroweak phase
transition within the light stop scenario (LSS) of the MSSM. We carry out the
analysis using the 2-loop thermal potential for values of the Higgs mass
consistent with present experimental bounds. Our approach relies on describing
the interaction between the bubble and the hot plasma by a single friction
parameter, which we fix by matching to an existing 1-loop computation and
extrapolate it to our regime of interest. For a sufficiently strong phase
transition (in which washout of the newly-created baryon asymmetry is
prevented) we obtain values of the wall velocity, v_w~0.05, far below the speed
of sound in the medium, and not very much deviating from the previous 1-loop
calculation. We also find that the phase transition is about 10% stronger than
suggested by simply evaluating the thermal potential at the critical
temperature.
