Here you can find my private selection of papers for SAXS newcomers.
Small-Angle X-ray Scattering from O. Glatter and O. Kratky (1982)
Small Angle X-Ray Scattering (SAXS) from Bulks and Surfaces (from Oleg Gang)
Basic introduction to Small-Angle X-ray Scattering (1 min. video by Brian R. Pauw)
The difference between Diffraction and Scattering