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S11 is the reflection coefficient (gamma).
Reflection coeff is defined here: https://en.wikipedia.org/wiki/Reflection_coefficient
We know that gamma = ratio of V-/V+ (or E-/E+, if you use E for voltage/electromotive force). Sxx (like S11) is also the voltage ratio of V-/V+ for the device under test, if you understand how S-parameters are determined, and what they represent.
I think only if all ports match ,gamma=Sxx