Absorbtion distance in Octane?

[marchermitte]

Hello!
I'm trying to achieve this effect that you get when looking at a window glass, the side reflects a greenish color (because of it's thickness) while the front is transparent (white transmission color)
Easy in Modo but how can I achieve that in Octane (without giving the side another surface name)?

Thank you!

[face_off]

the side reflects a greenish color (because of it's thickness)

Is that actually true? I thought the sides were actually coating differently resulting in that effect. If this is not the case, then the glass must have a green tint. To get this, use an RGB of 0.9, 1, 0.9 in the Transmission.

Paul