  Critical collapse of a spherically symmetric domain wall is investigated. The
domain wall is made of a minimally coupled scalar field with a double well
potential. We consider a sequence of the initial data which describe a
momentarily static domain wall characterized by its initial radius. The time
evolution is performed by a full general relativistic numerical code for
spherically symmetric systems. In this paper, we use the maximal slice gauge
condition, in which spacelike time slices may penetrate the black hole horizon
differently from other widely used procedures. In this paper, we consider two
specific shapes of the double well potential, and observe the Type II critical
behavior in both cases. The mass scaling, sub-critical curvature scaling, and
those fine structures are confirmed. The index of the scaling behavior agrees
with the massless scalar case.
