searching absorption coefficients of materials on the web

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Job Description

I have an article abaut physics and material science. This article about reflection coeffient of silicon solar cell. I have almost finished reading matlab codes but i need absorption coefficients of some materials. the absorption coefficients change with wavelength.
You will search absortion coefficient of the materials which are glass, ethylene-vinyl-acetate (EVA),tedlar and SiO2 at wavelengths from 0 nm to 4000 nm

for example absorption coefficient of material a= [1 1.2 3.5 ........ ] at wavelengths [0 10 20 30 ..... 4000 nm ]

Please you will read the article at the attachment and the we will discuss about it.