However, such a steep slope corresponds to interfacial Porod scattering and simply indicates the aggregate has become large enough that it's cross-sectional Guinier knee has moved below the accessible 𝑞-range as depicted by green curve and scheme in Figure . On the other hand, the high 𝑞 region is very similar between the low and high MW scattering profiles, which can be seen in both CB solutions by the presence of the lamellar peak and even more clearly in both Dec solutions by the nearly identical high 𝑞 Guinier knee and slopes. In this case, the similarity indicates that the polymer cross-section remains the same regardless of molecular weight or aggregation, which is to be expected. Additionally, it indicates that the lamellar stacking is consistent as well. Overall, the dual aggregate and polymer population model is consistent with the molecular weight and solvent data. Based on these conclusions, we illustrate in Figure below each MW pair a simplified scheme of green and blue curves corresponding to scattering of large and small elongated objects, respectively. The scheme illustrates the separate contributions of the large fibril aggregates and the smaller semiflexible polymer chains and how the shifting of the fibril contribution can produce the overall scattering curves seen by experiment for the low and high MW PII-2T. This interpretation is confirmed by our imaging results discussed below.