Is there an expression that lets you switch between layers every other frame?

Kind of like flickering back and forth between two layers. I'm guessing adding an expression to the opacity on the top layer would do it.
Thanks,
Josh

Something like this applied to the opacity of the top layer:
f = timeToFrames(t = time + thisComp.displayStartTime);
if (f % 2 == 0){
0}
else 100
It's just a simple java test for even numbers
Hope this does what you want.
Another variation would be:
f = time / thisComp.frameDuration;
s = Math.round(f);
if (s % 2 == 0){
0}
else 100

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