The quality doesnt have to be perfect because this is just me hacking a VR headset and adding stuff to it at this point so not for a professional equipment. I need a film, thin plastic or glass that will pass 80 to 90 of the incoming light and reflect 10 to 20 of that light, at a 45 degree incidence. What can I use for this? Or are these kind of non-50/50 mirrors available on alibaba or similar under a certain name?