I am still waiting for answers

Plastic thickness is very important for mulching. Please suggest if possible.

1.5 to 2 mils

Soil Solarization in details in the attached file

Soil Solarization for Gardens & Landscapes

http://ipm.ucanr.edu/PMG/PESTNOTES/pn74145.html

How To Use Plastic Sheeting And Mulch

https://gardeningcalendar.ca/how-to-use-plastic-sheeting-and-plastic-mulch-in-the-garden-pros-cons/

Use of black plastic for soil solarization and post-plant mulching.

http://www.fao.org/3/T0455E0j.htm