CEMS performed in backscattering geometry is an especially
adequate tool to identify iron-based phases in the 100 nm layer below
the surface. The spectra were acquired using a 57Co source in Rh matrix
and a proportional counter with He-5%:CH4 flow. The data were fitted
with WinNormos on IGOR® software, using hyperfine parameters
from the literature as initial values. Isomer shifts are presented relative
to α-Fe.