My thoughts pertaining to any LAC split is that it will be something like the FMC Livent split:

"FMC Corporation (NYSE: FMC) announced today that it has determined the final distribution ratio relating to its previously announced distribution of an aggregate of 123,000,000 shares of common stock of Livent Corporation ("Livent") (NYSE: LTHM) on March 1, 2019, the distribution date, as a pro rata dividend on shares of FMC common stock outstanding as of 5:00 p.m. EST on the record date of February 25, 2019.

Based on the shares of FMC common stock outstanding as of February 25, 2019, the record date for the distribution, each share of FMC common stock will receive 0.935301 shares of Livent common stock in the distribution."

https://www.prnewswire.com/news-releases/fmc-corporation-announces-distribution-ratio-for-final-separation-of-livent-corporation-300802614.html

AXP