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Understanding structure–property relationships in soft and polymeric materials is essential for advancing their technological and biomedical applications. In this proposal, we aim to exploit the capabilities of Small‑Angle X‑ray Scattering (SAXS) at the NCD‑SWEET beamline to investigate two representative systems that illustrate fundamental principles of hierarchical organization in soft matter. First, we will follow the structural evolution of polycaprolactone (PCL), a semicrystalline, biocompatible polymer widely used in additive manufacturing for biomedical devices. PCL exhibits a lamellar morphology whose thickness, periodicity, and degree of ordering are highly sensitive to thermal history and processing conditions. SAXS is ideally suited to monitor these lamellar structural changes in situ, enabling us to correlate thermal transitions with nanoscale reorganization relevant for 3D‑printing applications. Second, we will study the self‑assembly of sodium dodecyl sulfate (SDS), a model anionic surfactant commonly used in biochemical protocols for protein denaturation. Above its critical micelle concentration (CMC), SDS forms spheroidal micelles whose size, shape, and aggregation number depend strongly on ionic strength and solvent composition. By performing SAXS measurements under varying ethanol content and salt concentration, we will explore how these environmental factors modulate micellar structure and interparticle interactions. Together, these two systems provide complementary examples of polymer crystallinity and surfactant self‑assembly, offering an excellent pedagogical framework for the HERCULES practical session. The proposed experiments will allow participants to gain hands‑on experience in SAXS data acquisition, modeling, and interpretation while addressing scientifically relevant questions in soft‑matter physics.