Step 3
On the Layers palette, highlight and turn ON the visibility for the Copy of Raster 1 layer:

Effects > 3D Effects > Inner Bevel...>
Use the following settings (all were doing differently is changing the Angle from 270 to 0:

Your image should now look similar to this:

Now we apply the magic.
On the Layers palette, set the Blend Mode to Exclusion:

Layers > Merge > Merge Down
Your final image should look similar to this:

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