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In page Sonority hierarchy:

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Syllable structure tends to be highly influenced and motivated by the sonority scale, with the general rule that more sonorous elements are internal (i.e., close to the syllable nucleus) and less sonorant elements are external. For instance, the sequence /plant/ is permissible in many languages, while /lpatn/ is much less likely (this is the sonority sequencing principle). This rule is applied with varying levels of strictness cross-linguistically, with many languages allowing exceptions: for example, in English, /s/ can be found external to stops even though it is more sonorous (e.g. "strong", "hats").[citation needed]