Radial distribution function is a very useful tool for determination of the polymer structure. The connection between the scattered X-ray intensity and radial distribution function is presented. Some examples of RDF for polyethylene and for poly(ethylene terephtalate).
"Radial distribution function in polymers", Proc. SPIE 3095, X-Ray Investigations of Polymer Structures, (18 February 1997); doi: 10.1117/12.267202; https://doi.org/10.1117/12.267202