We investigate the local feedback stabilization of single input contro
l affine analytic systems x = f(x) + ug(x) in the plane. New necessary
and sufficient conditions for local stabilization with feedback laws
of the form u = v(x,, x,), (delta v/delta x(1) (0, 0))(2) + (delta v/d
elta x(1) (0, 0))(2) not equal 0, v(0, 0) = 0, are obtained by using L
yapunov's stability theorems on two-dimensional analytic systems. If t
he sufficient conditions are satisfied, we also provide explicit feedb
ack laws.