not neccessarily thicker but by employing a soma technique that i use you can redirect some o fthe energy to the lower branches whilst the knuckle refforms on the top branches .. the result and teh reason i use it i that i can get more heads to the canopy of light
2 or 3 nodes down and squeeze till you feel it pop dont worry it will be fine
from soma tips
"
Another one of my tricks is stem bending, a technique where you roll the stem inbetween your fingers while squeezing fairly hard, but not hard enough to break the stem, then slowly bend the stem over. The stem forms a hard elbow where it was bent and the top straightens itself out so that it can continue pointing at the Sun (grow light ). The result is what is called Supercropping. The secondary buds underneath the tops, build up with a survival hormone because of the stress factor and become at least twice as large as normal, increasing the yield and potentcy. I do this technique to each plant quite a few times as they are growing to achieve an even canopy as I look at the plants from the top."
+ rep me up

if its helpful please