I was trying to apply LCF for XANES or EXAFS for biogenic Mn oxides (layer type Mn oxides). Using the standards (Mn2O3, Aqueous Mn2+ and dMnO2) I cannot fit the LCF for my XANES or EXAFS data (attachment).   

I am not really sure what are the problems with the standards (as I expect mainly Mn(III) or Mn(IV) in my samples). It would be really great, if anyone could provide me the Mn(III) oxide standard or have a look at the data and please let me know, if I have done any thing wrong.

Best regards

Sathish