where θj is the angle of the jth nonzero peak. If a sample exhibits the following sequence:
sin θ2
sin θ1
,
sin θ3
sin θ1
,
sin θ4
sin θ1
,
sin θ5
sin θ1
sin θ6
sin θ1
,
···= 1.1547,1.633,1.9149,2,2.309,
what is the crystal structure of the sample?