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Can “layers” be used as in “there are two layers of liquid” although two layers are totally the same?

Ex) Atmosphere consists of 4 layers because 4 layers are totally the same except temperatures.

Should there be something different?

I guess two layers are distinguished only by where they are positioned.

Ex. There are two layers. One layer is positioned at a depth from 0m to 100m, and the other layer is positioned at a depth from 100m to 200m.

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    Sure. There's no rule that says the substance has to change, as long as there's something different from one level to the next, you've got layers.
    – gotube ♦
    Commented Jul 19, 2021 at 4:09
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    @gotube You mean there should be something different?
    – user139856
    Commented Jul 19, 2021 at 5:09
  • @user0070 I think It would be count to 1 layer.
    – boscoche
    Commented Jul 19, 2021 at 7:43
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    If there is no difference between the layers they are not different layers!
    – Kate Bunting
    Commented Jul 19, 2021 at 7:59
  • @Kate Bunting You mean they are still layers even though they are not different?
    – user139856
    Commented Jul 19, 2021 at 8:12

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Yes, of course!

You can have a two-layer chocolate cake, for example. Both layers are of chocolate cake.

Obviously, for the layers to be counted separately, there must be some distinguishing factor. In your example, the difference is the temperature. It could simply be that the two layers were laid at different times. It doesn't matter if, in the end product, the two layers are not easily distinguishable - if the process of laying them was separate, then they are different layers.

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