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X-ray diffraction profile of the sample. Inset: the grazing incidence x-ray (200) diffraction (GID) profile taken at the incident angle of 0.3°.
(a) X-ray reflectivity profiles of the sample. (b) vs to show the oscillations clearly.  fitting without surface layer (dashed line) and  fitting with surface layer (solid line).
The electron density profile (EDP) derived from the best fit to the experimental data.
Angle-resolved XPS spectra of Ba core level taken at the takeoff angle of 15° (surface sensitive), 30°, 45°, and 90° (interface sensitive).
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