The correct spelling of "lay one door" is actually "lei wan dor". The IPA phonetic transcription of this word would be /leɪ wɒn dɔːr/. The confusion in spelling comes from the pronunciation of certain words in certain dialects. "Lay" is pronounced as "lei" in some dialects, while "one" can sometimes sound like "wan". Similarly, "door" can sometimes be pronounced as "dor". Therefore, to correctly spell this phrase, it is important to consider regional variations in pronunciation.