Furthermore, it supports the argument that the low 𝑞 scattering is due to Porod scattering of the aggregate's interface rather than from a dimensionality of 3. For high MW PII-2T in Dec the SEM image shows fibrils as well as a large agglomerated fibril network. The fibril width appears to range from several 10's of nm to 100 nm in the agglomerate. AFM of the agglomerates shows heights of several 10's of nm as well. Additionally, what is quite interesting is that the large change in the degree of aggregation and agglomeration from low MW to high MW stems primarily from the increased polydispersity of the molecular weight distribution. Looking at the molecular weight distributions (Figure ) the peak molecular weights are in fact the same and so the difference in the mean Mn and Mw values stem primarily from the existence or lack thereof of the low molecular weight tail which affects the polydispersity. We note that we observed features consistently ~2.5 nm high but several 10's of nm wide in the AFM imaging of freeze-dried Dec solutions. This can be seen more clearly when scanning the samples at a higher magnification as shown in Figure . We attribute these features to adsorption during the sample preparation. For an extended discussion on these ribbon-like features and why they do not contribute to SAXS and likely do not exist in solution see supplementary section S2.