Table 1. Fitting Results for SFG Spectra Shown in Figure 2^a.

subphase	polarization	peak center (cm–1)	peak width (cm–1)	χeff	ratio	tilt angle (deg)
60% phosphate buffer/40% TFE	ssp	1657	14.2	14.8	2.09 ± 0.01	46 ± 1
	ppp	1657	14.7	51.1
PBS buffer/40% TFE	ssp	1650	11.0	8.8	2.43 ± 0.06	78 ± 11
	ppp	1652	14.0	17.6

^aErrors represent standard deviations of four replicates obtained in each of two individual experiments.