Heat reflecting window tint

[vinny186]

I have heat control window tint on my west facing windows that is also mirrored. It does a solid job of reducing the heat gain to the upstairs bedrooms but i wonder if I could improve it by adding another layer on top of the original layer?

 

[Flyover]

I saw an old Jeep Cherokee and someone had tinted the windows -- white. Like one of those vehicle wraps, or what you sometimes see on public buses, where if you got real close to it you'd see it's just a lot of tiny dots. I wonder if that kept the inside of the Jeep cooler than if they'd tinted the windows dark in the conventional way.