Plane waves and reflection

not relating to any specific homework question:

how can i go about calculating the relative phase of reflected / transmitted fields for normally incident plane waves?

for example, i know how to calculate the relative amplitude of the reflected field from the reflection coefficient:

$$\Gamma$$ = Er/Ei = ($$\eta$$2-$$\eta$$1)/($$\eta$$2+$$\eta$$1)

however, what if i want to calculate the relative phase?

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