TECHNOLOGY FOCUS - POLYMERS - Preferred Components: The segments comprise segments having an identical structure and the linkers comprise linkers having an identical structure, where the segments that are not at the edges of the SOF are connected by linkers to at least 3 other segments. The segments comprise at least a first and a second segment that are different in structure, and the first segment is connected by linkers to at least 3 other segments when it is not at the edge of the SOF. The linkers comprises at least a first and a second linker that are different in structure, and the segments comprises either: at least a first and a second segment that are different in structure, where the first segment, when not at the edge of the SOF, is connected to at least three other segments, in which at least one of the connections is via the first linker, and at least one of the connections is via the second linker; or segments having an identical structure, and the segments that are not at the edges of the SOF are connected by linkers to at least 3 other segments, where at least one of the connections is via the first linker, and at least one of the connections is via the second linker. The segments have a core comprising carbon, nitrogen, silicon, or phosphorus atomic cores, alkoxy cores, aryl cores, carbonate cores, carbocyclic cores, carbobicyclic cores, carbotricyclic cores or oligothiophene cores. The linkers are single atom linkers, single covalent bond linkers, double covalent bond linkers, ester linkers, ketone linkers, amide linkers, amine linkers, imine linkers, ether linkers, urethane linkers or carbonates linkers. The SOF comprises at least one atom of an element that is not carbon, and the atom of an element is hydrogen, oxygen, nitrogen, silicon, phosphorus, selenium, fluorine, boron or sulfur. The SOF has less than 10 pinholes, pores or gaps greater than 250 nanometers in diameter per cm2. The SOF is periodic. Preferred Process: The process (I) further comprises: promoting a reaction of the functional groups, where no byproduct is formed as a result of the reaction of the functional groups; removing the dry SOF from the substrate to obtain a free-standing SOF; chemically attaching the dry SOF to the SOF substrate by either covalent or ionic bonds; and promoting a reaction of the functional groups, where a volatile byproduct is formed as a result of the reaction of the functional groups. In the process (I): the SOF is formed after the wet film is exposed to oven drying or infrared radiation (IR) or oven drying and IR drying; and the reaction mixture is deposited as a wet film on a substrate, where the substrate is a SOF substrate. EXAMPLE - Benzene-1,4-dimethanol (0.47 g) and N4,N4,N4',N4'-tetrakis(4-(methoxymethyl)phenyl)biphenyl-4,4'-diamine (1.12 g) and of 1-methoxy-2-propanol (17.9 g) were mixed. The mixture was shaken and heated to 60 degrees C until a homogenous solution resulted. Upon cooling, the solution was filtered. To the filtered solution was added an acid catalyst delivered as a 10 wt.% solution of p-toluenesulfonic acid in 1 -methoxy-2-propanol (0.31 g) to give liquid containing reaction mixture. The reaction mixture was deposited as a wet film. The reaction mixture was applied to the reflective side of a metalized MYLAR (RTM: Polyester film) substrate using a constant velocity draw down coater outfitted with a bird bar having an 8 mil gap. The change of the wet film to a dry structured organic film (SOF) was promoted. The metalized MYLAR (RTM: Polyester film) substrate supporting the wet layer was rapidly transferred to an actively vented oven preheated to 130 degrees C and left to heat for 40 minutes to give a SOF having a thickness of 3-6 microns, which was delaminated from the substrate as a single free-standing SOF.