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[yunhee.chang@kriss.re.kr]

Dear Abinit users,

I'm calculating the phonon dispersion band of In/Si(111) surface.
At that time, I'm using the linear response theory in Abinit.
In the response function calculation, there are rfphon, rfatpol, rfdir, 
rfelfd options.
But there is no the parameter to control the quantity of perturbation.
I think, when I use the rfdir option, the direction of displacement is 
controled.
But how much the atomic position is moved???
How much the charge density is perturbed??
Maybe the default value is present in the program,
where can I know this parameter's information.

Would you give me any comments?

Thank you~!

Best regards,
Yunhee Chang