  This paper is a subsequent paper of math.RT/0607673. Here we consider the
irreducible components of Springer fibres (or orbital varieties) for two-column
case in GL}_n. We describe the intersection of two irreducible components, and
specially give the necessary and sufficient condition for this intersection to
be of codimension one.
  Since an orbital variety in two-column case is a finite union of the Borel
orbits, we solve the initial question by determining orbits of codimension one
in the closure of a given orbit. We show that they are parameterized by a
specific set of involutions called descendants, already introduced by the first
author in a previous work. Applying this result we show that the intersections
of two components of codimension one are irreducible and provide the
combinatorial description in terms of Young tableaux of the pairs of such
components.
