MOVPE grown cubic zincblende GaN samples
University of Cambridge

Position of reflections:

hkl	Chi	|Q|
1	deg	Å^-1

002	0	2.78614
004	0	5.59162
115	15.79	7.26024
113	25.24	4.62598
224	35.26	6.84414
111	54.74	2.42603
222	54.74	4.84364
331	76.74	6.06671
220	90	3.9579
440	90	7.86326



Fit of data:

beta × |Q| =

(
   ( beta_tilt × cos(Chi) × |Q|)^2
 + ( beta_twist × sin(Chi) × |Q|)^2 
 + ( 2 × pi / L)^2 
)^0.5



beta_tilt = 0.755 deg = 0.0131792 rad
beta_twist = 0.864 deg = 0.0150809 rad
average lateral finite size = L = 207.35 A

with Q in 1/Ångström (= 1/Å) & beta in rad