Calculation of the intensity of EPC is too big

[jgsi]

Dear all,
I repeated the calculations of MgB2, and get almost effective results. But unfortunately, I get a uncommon value of lambda (~180) when I start my research. I checked my jobs and the result of wannier interpolation (both band and phonon dispersion curves), which shows the same dispersion compared to the QE results. Why the lambda is so big? Are there any parameters that can improve this situation? Here, I want to explain that my system is a two-dimensional material， will this effect the lambda?

Best wishes,
jgsi

[jgsi]

I changed the pseudopotentials files from US to NC, the results become acceptable.