Annie,
The OED says the stress is on the penultimate syllable. I think you (and I) hear it said with the primary stress on the ultima sometimes (me: often, and how I say it) because that's where it is in Greek.
All that's to say that the word can be two iambs or two trochees and be okay, you just want to think about the speaker of the poem: are they going to be more interested in standard pronunciation or Classical?
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