There are many ways to synthesize these 2D materials, including liquid exfoliation, chemical vapor deposition (CVD), and molecular beam epitaxy (MBE). A particularly versatile synthesis method that does not require a substrate is chemical vapor transport (CVT). CVT utilizes a reversible chemical reaction that slowly deposits the target material as single crystals at a temperature that favors solid deposition. For many 2D materials, large crystals were first grown by CVT, such as CrAs and TaSe 2 , and it is a viable method to discover new materials due to the straightforward setup and the large number of tunable experimental variables. Iodine is the most widely-used transport agent, in addition to a large library of possible transport agents, and this will especially lead to the discovery of new iodine-containing compounds. The crystals synthesized by CVT are bulk, but often they can be exfoliated down to a few layers or monolayers if the planes are separated by van der Waals interactions.