  We investigate identity-based solutions associated with marginal deformations
in open string field theory. We find that the identity-based marginal solutions
can be represented as a difference of wedge-based solutions plus an integration
of a deformed BRST exact state. Using this expression, the gauge invariant
overlap can be calculated analytically for the identity-based solutions.
Moreover, we show that, by gauge transformation, the overlap is transformed
into a disk correlation function with the integrations of currents at the
boundary.
