thank you for your reply
In observation line 1, i couldn’t find the reflectance, in line 2 with absolute value i find reflectance. Observation line 1 power spectrum graph is not look like reflectance, it is maybe the transmission and reflection is observation line 2 with Absolute value.
Like in the paper above is attached, the structure no 1 results shows graphs reflectance versus wavelength, the graph is dropping at some wavelength which i can see same case in my observation line 2 with absolute value not in the observation line 1.
Please correct me if i am wrong?