  We present an analysis of the structure of the fluctuation-induced
microemulsion phase in a ternary blend of balanced AB diblock copolymers with
equal amounts of A and B homopolymers. To this end, graphical analysis methods
are employed to characterize two-dimensional configuration snapshots obtained
with the recently introduced Field-Theoretic Monte Carlo (FTMC) method. We find
that a microemulsion forms when the mean curvature diameter of the lamellar
phase coincides roughly with the periodicity of the lamellar phase. Further, we
provide evidence to the effect of a subclassification of the microemulsion into
a genuine and a defect-driven region.
