Log Power Rule (Substituting a 2^X)

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Always approach Logarithms with uncertainty. a bit confused by Log of power rule. Hope to receive some simple clarifications. Found this post very interesting. Where we basically have $T(n) = \Theta(n^{\log_2 3})$. as we plug in $2^n$, shouldn't it become \begin{equation} \Theta(2^{n^{\log_2 3}}) \end{equation}.

If so, we can't do any further simplification, can we ?
or it is correct to have $T(2^n) = \Theta(2^{n\log_2 3})$. if so, what if we plug in $2^{n^{n}}$, what should it be ?

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$T(2^n)$ is not $2^{n^{\log_23}}$, it's $(2^n)^{\log_23}=2^{n\log_23}$.