  A generalized version of the Randall-Sundrum model-2 with different
cosmological constants on each side of a brane has been discussed. A
possibility of replacing the singular brane by a configuration of a scalar
field has been also considered, the Einstein equations for this setup were
solved and stability of the solution discussed. It has been shown that under
mild assumptions the relation between cosmological constants and the brane
tension obtained in the brane limit does not depend on the particular choice of
the regularizing profile of the scalar field.
