  Unit cell parameters obtained from X-ray powder diffraction data are
presented for the crystalline phase of a liquid crystal 4-butyloxyphenyl
4'-decyloxybenzoate: a = 23.098 (4) {\AA}, b = 5.974 (6) {\AA}, c = 12.357 (10)
{\AA}, \b{eta} = 121.53 (8){\deg}, unit-cell volume V = 1453.56 {\AA}3.
Temperature dependent X-ray diffraction data confirmed the existence of smectic
A and smectic C mesophases and a more ordered, tilted crystalline smectic
phase. Possibility of existence of previously reported smectic B phase as well
as another crystalline phase was refuted.
