Strontium K-alpha X-ray fluorescence intensity of SrTiO3 (001) single
crystal is measured as a function of azimuthal and polar angles of det
ection. Anisotropy is observed due to the interference effect of fluor
escent X-rays in the solid. X-Ray fluorescence holography is discussed
from the viewpoint of chemical analysis. X-Ray photoelectron intensit
y anisotropy is compared with the present measurement.