Grazing-Incidence Small-Angle Neutron Scattering (GISANS) is an experimental technique to study nano structures at surfaces and interfaces of thin films as well as multilayers and buried systems. Introductory information about this technique can be found here:

If you have an interest to learn more about GISANS you could also consider to participate in the annual course by the Swedish graduate school in neutron scattering (SwedNess). More information can be found at the Course Webpage.

Schematic GISANS figure to the right is from H. Frielinghaus, et. al, Phys. Rev. E 85, 041408 (2012).