Table 2. Stacking parameters of the PDTFDPP16 and PDTFDPP20 thin films.

	π-Stacking		Lamellar stacking		R L c
	d a (Å)	L c b (nm)	d a (Å)	L c b (nm)
PDTFDPP16	3.6	4.0	16.8	10.1	2.5
PDTFDPP20	3.8	3.4	21.6	19.5	5.7

^aSpacing of diffraction peak.

^bCorrelation length based on Scherrer's equation.

^cRatio of L _c (lamellar spacing) to L _c (π-stacking).