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I have two textures with transparency and I want them on top of each other with a Diffuse shader below them via the Material nodes in Cycles.

setup

desired result

Because I'm using the Material nodes and not the Compositor, I can't just simply use the Alpha Over node.

Here's as far as I got. (Ambient Occlusion is enabled. I need both textures at full opacity.)

my failed node setup

My problem seems to be stemming from the fact that I don't know how to combine alpha channels, if that helps.

How do I do this?

(It MUST be done in the Materials node editor.)

Here's the .blend file:

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The alpha channel of both images can be combined ( in this case it works if you add them, but you can also do other operations depending on your needs) and used to control the mix for the colors or shaders:

enter image description here

or:

enter image description here

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