What is stracturalism phonology?

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Now I read linguistics book about structuralism phonology. The book is written “How do you analysis /ɛ/ /e/ /ɔ/ /o/？” The book is not written detail explanation.

I considered the answer. Would you please look at below?

/ɛ/ analysises　 +front +rounded +mid- open. /e/ analysises 　+front +rounded +mid-closed. /ɔ/ analysises 　+back +unrounded +mid- open . /o/ analysises　 +back +unrounded +mid-closed.

Does structuralism phonology analysis above answer?

I am a foreigner. And I dont learn English lectures in linguistics. If you dont understand my English,point out detail thing.