It appears from references I read on the net, especially from 'Kamakoti Mandali', that Sri Kamakshi Amman at Kanchipuram, Tamil Nadu, is really not Kamakshi but a form of Kalasamkarshini Kali, an ugra devata who was appeased by Adi Sankaracharya and that her yantra at this temple is not really the Shri Yantra which belongs to Sri Kamakshi Amman.
From a source, it appears that there is 1. Parvathi and 2. Uma. Parvathi is supposedly Sri Raja-Rajeswari and also known as Mula-Kamakshi or 'Adi-Kamakshi'. Uma supposedly is an amsha of this Adi-Kamakshi who did penance to attain Sri Ekambareswara and finally worshiped Sri Adi-Kamakshi and attained Lord Shiva after Adi-Kamakshi blessed her. Adi Kamakshi also gave her own name of 'Kamakshi' to Uma, so there came to be 2 Kamakshis.
So given this understanding some questions arise:
i) Where then one can find temples for Adi-Kamakshi and of Uma?
ii) Is Tripura Sundari same as 'Raja-Rajeswari'? Because Kamakshi is known to be the same as goddess Tripura Sundari and I am not sure whether Kamakshi-Uma is Tripura Sundari or Adi-Kamakshi, the Raja-Rajeswari is Tripura Sundari.
iii) Also, paragraph numbered 2 in the above given source describes about one Mahakameshwara Mithuna. I am not certain what is meant by it from the description given. Does anyone know more?