Table 1. GISAXS and GIWAXS spacings measured from data in Figures S3 and S4.

Sample	GISAXS spacings/	GIWAXS spacings/Å	Origin
1 wt% peptide 1	62.2		Long spacing–third order
	41.2	41.2	Long spacing–second order
	18.1	18.1	First order (mol. length ~17 Å)
	11.3	11.3	β-sheet stacking distance
		4.8	β-strand spacing
		4.4	β-strand spacing splitting
		1.9	Intramolecular spacing
		1.6	“
		1.5	“
2.3 × 10−3 wt% peptide 2	87.5
	14.9	14.9
		9.2	β-sheet stacking distance
		4.7	β-strand spacing
		1.9	Intramolecular spacing
		1.4	“