  Field Induced Spin Density Wave (FISDW) systems exhibit coexistence phases
between well defined quantum Hall plateau phases with even integers 2N and 2N'.
We show that a disordered coexistence region accounts for the observed peaks in
the longitudinal resistivity as the field varies between plateaux. It also
results in a random spin mixing which yields two energy split extended states.
The longitudinal resistance is expected to show peaks witha temperature (T)
dependent width proportional to the kappa's power of T. The peak width should
saturate below the non-nesting interlayer coupling of order 40 mK
