making a stereo gif - step by step

Here is a step by step run through of how I am learning to make stereo gifs using Photoshop.

A pair of stereo photographs I found online (source unknown)

step 1: copy and paste one image into new document

step 2: copy and paste second photo onto a new layer

step 3: lower opacity on one of the layers to 50%,
adjust layers to be in-line with one another

step 4: create animation 2 animation frames,
have only the lower layer visible on the first frame

step 5: have only the top layer visible on second frame

step 6: set frame delay to 0.1 sec for each frame

lastly, save for web and devices

The final result...