The crust, more specifically the lithosphere.
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The Earth's crust is the thinnest layer, ranging from about 5-70 km thick. The average density of the Earth's crust is around 2.7-3.0 g/cm³.
The thinnest layer of the Earth's crust is known as the oceanic crust. It is typically around 5-10 kilometers thick and is composed mainly of basaltic rock. The oceanic crust is denser and younger than the continental crust, which is why it is thinner.
The epidermis is the thinnest layer of the skin. It is the outermost layer that provides a protective barrier for the body.
The ratio of the thinnest layer to the thickest layer depends on the context. In a general sense, it could be any fraction from 0 to 1 (thinnest being 0 and thickest being 1).
The Earth's surface layer is called the crust.