Molecular layer deposition (MLD), a thin film deposition technique, has attracted significant attention in recent years as a suitable approach for the deposition of organic-inorganic hybrid films for applications in several technological application areas, including packaging/encapsulation, electronics, batteries and biomedical applications. [2][3] MLD is very similar to the widely used atomic layer deposition (ALD) technique, which involves the fabrication of inorganic films used extensively in photovoltaics, (nano)electronics, energy storage and catalysis. [6] . Similarly to ALD, MLD is based on sequential self-limiting reactions of readily vaporized inorganic precursors but the second reactant is a highly volatile organic specie. Thus, in contrast to ALD, in MLD the deposition chemistry can be extended by including organic precursors, leading to the deposition of hybrid organic-inorganic MLD films. Two organic precursors can also be employed to deposit pure organic MLD films, such as polymers. Similar to ALD, MLD enables the deposition of conformal and smooth films with a controlled thickness at Angstrom level. The advantages offered by hybrid organic-inorganic MLD films are that they are ultrathin films with high flexibility, have tunable properties and excellent mechanical and electronic properties resulting from the combination of the individual properties of the organic and inorganic components that are incorporated into the film. [2] [14] A special class of hybrid organic-inorganic films are so-called metalcones, which are fabricated via MLD using organometallic precursors and organic alcohols. These films are described as O-M-O-(CHx)y-O-M-O. Metalcones are known to be flexible in nature due to the flexible organic backbones present in their architectures and with excellent mechanical properties at the atomic and molecular level arising from the organometallic precursors. The first metalcone films were Al based and were known as "alucones". [19] Soon after, other metalcone groups were developed, such as the Ti, Zn, Hf, Mg and V based metalcones known as "titanicones", "zincones", "hafnicones", "magnesicones" and "vanadicones" respectively. While other organic backbones, e.g. aromatic rings, have been used, the field tends to use the term "metalcone" as a general description for these hybrid materials.