  In a thin strip of a two-dimensional semiconductor electronic system,
spin-orbit coupling may be induced near both edges of the strip due to the
substantial spatial variation of the confining potential in the boundary
regions. In this paper we show that, in the presence of boundary-confinement
induced spin-orbit coupling, a longitudinal charge current circulating through
a 2D semiconductor strip may cause \textit{strong} non-equilibrium spin
accumulation near both edges of the strip. The spins will be polarized along
the normal of the 2DEG plane but in opposite directions at both edges of the
strip. This phenomenon is essentially a kinetic magnetoelectric effect from the
theoretical points of view, but it manifests in a very similar form as was
conceived in a spin Hall effect.
