It has been found that the high-energy He-ion irradiation effect on the upp
er critical magnetic field H-c2(T) of YBaCuO and NdCeCuO epitaxial films is
the same as the result of variations of oxygen content or ratio Nd/Ce. In
all these cases the effect of the electron scattering change on the resisti
vity and the H-c2 is not significant in comparison with a dramatic change o
f the electron structure.