1. Classical Latin:
* TOO-ni-ka (emphasis on the first syllable)
This pronunciation is used when referring to the ancient Roman garment known as a "tunica."
2. Modern Italian:
* TOO-nee-kah (emphasis on the second syllable)
This pronunciation is used when referring to the Italian word "tunica," which means "tunic" or "coat" in English.
So, to be sure of the correct pronunciation, consider the context and the language being spoken.