Hello -
Others will have better and more definitive information but I will share what I remember from reading a research paper written by (I think) a Phd student at Texas A&M.
Clear, heavy plastic; not black or other.
Soil cleared of weeds first and well watered.
Plastic tucked/buried at the edges
Cover the soil for four weeks during the hottest part of the year.
After solarization fresh compost should be worked into the soil to reintroduce beneficial microorganisms which have been killed - solarization is, after all, a non-selective process.
In the case of raised beds I shouldn't think 'wrapping' the sides would have any effect as it is the direct, amplified solar heat on the soil surface and radiating downward that is responsible for the effect.
As I recall it was being tested as a means of minimizing weed germination and growth though they noted that in addition to weeds and weed seeds it also killed bacteria, nematodes, insects (both good and bad), etcetera. Whether it will have an impact on disease from soil-borne bacteria is unclear to me.
Good luck.
