The spelling of "Rhea Olsen" can be explained using IPA phonetic transcription. "Rhea" is spelled as /riə/, with the stressed syllable being the first one. It is pronounced as REE-uh. "Olsen" is spelled as /ˈoʊlsən/, with the stress on the first syllable. It is pronounced as OHL-suhn. By breaking down each word phonetically, the correct spelling of "Rhea Olsen" can be easily understood and articulated.