  Polarized inclusive deep-inelastic diffractive scattering is dealt with in a
quantum field theoretic approach. The process can be described in the general
framework of non-forward scattering processes using the light-cone expansion in
the generalized Bjorken region applying the generalized optical theorem. The
diffractive structure functions $g_1^{D(3)}$ and $g_2^{D(3)}$ are calculated in
the twist-2 approximation and are expressed by diffractive parton
distributions, which are derived from pseudo-scalar two-variable operator
expectation values. In this approximation the structure functions $g_2^{D(3)}$
is obtained from $g_1^{D(3)}$ by a Wandzura-Wilczek relation similar as for
deep inelastic scattering. The evolution equations are given. We also comment
on the higher twist contributions in the light-cone expansion.
