Dear community 

Greetings, I am currently trying to develop some parameters for InAs for DFTB+; I have encountered some problems (especially for the electronic part of As, which gives me high relative errors for some crystalline phases). however, my main question relies on the way of choosing relative weights. Since I wish to study crystalline phases and nanostructures, I chose 20 % of weight function width for the paths and low maximum expansion/contraction (I chose scale for crystalline As, In and InAs). I wish to emphasize the InAs so the InAs path has force enabled and more weight than As-As and In-In paths have been assigning weights by trial and error. My question is: Is there a way to estimate the values of the weights in each case, so I only have to do a fine-tuning? 

I respect your knowledge and experience in this field. Thank you in advance for your suggestions.

Best regards

Alejandro