Hello Matt Sir,

                      Thanks a lot for your valuable sugestions. I had fitted the Cu foil spectra as you suggested. I had taken same SO2 value for all the paths and after fitting the first shell , making its parameter fix when fitting second shell I changed the fit R range 2.9- 3.7 in order to make the contribution of first shell negligible. I got a nice fit.  The values of different parameters I got are as follows :

E 0=2.90 eV   ,  SO2= 0.72

 1st shell  R = 2.54, delR= -0.011, SS2=0.0083

 2nd shell R= 3.69,   delR= 0.080,  SS2=0.0088

The experimental data is taken at room temperature.

Are these parameters within the experimental error limit. Please tell me

                                                  with regards

                                                  Abhijeet Gaur