Recent developments in the theoretical treatment of SERGIS have significantly advanced our understanding of the capabilities of the technique. Numerous examples of scattering from stronly scattering model systems have illustrated that the theoretical approach is robust. At the same time a number of systems that were expected to scatter have proved difficult to measure. In this proposal we wish to push our understanding of the technique forward to explore engineered "imperfect" samples. This will enable greater understanding of the limitations of both the theory and instrumentation.