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I'd like to do some simulations with window tinting film that has some anti-reflective qualities.

Any tips on how I would make a material that still reads as glass but tends to reflect emitters less?

This is the product:

http://solutions.3m.com/wps/portal/3M/e ... on_Series/

You can achieve this by setting a low attenuation value and that's all.

Attenuation? That will make it more opaque, no?

I would make reflectance 0 and 90 darker.

Opaque? No, "dark" is the right word. As we don't have sub-surface scattering in the example, attenuation can only make it darker but, it still remains clear. Changing the reflectance wouldn't make glass darker. You can only cut off the reflections that way...

Yep, "dark" is the right word, but he doesn't want a darker glass but a glass with less reflections.

Edit: well, he also wants it darker... I didn't notice it in first read.

To simulate a film I sometimes take the wizard glass, then duplicate the bdsf and mix around 60/40 depending on the tint of film, then set the transmittance to black for one the bdsfs.
If you want to reduce the reflectance you are better off not using the wizard glass and changing the reflectance chip to suit your needs

Using 2 BSDF will render slower than 1 BSDF. So, decreasing the attenuation is strongly recommended for making dark glass instead of polluting the material composition with an additional so called darkening BSDF.

Tom, I think you are right in terms of efficiency and simply darkening glass but altering the attenuation simulates dark colored glass rather than a film, right? A film tint does not vary as the glass gets thicker or as light enters at different angles

Right, it's a shortcut for constant thickness.