NOVELTY - Polymer (I) comprising at least one (hetero)aryl repeating units (1a) and (2a), is new, where the polymer has a degree of polymerization of 100-1000.    USE - (I) is useful in a composition for forming an electrically conductive layer, which is useful in an article, preferably electronic device including light-emitting diodes, light emitting diode displays, liquid crystal displays, electronic paper, touch screens, diode lasers, photodetectors, photoconductive cells, photoresistors, photoswitches, phototransistors, phototubes, infra-red detectors, photovoltaic devices, solar cells, transistors, diodes, memory storage devices, antistatic films, biosensors, electrochromic devices, solid electrolyte capacitors, energy storage devices, electromagnetic wave shielding films, window deicers, heat reflectors, architectural materials, electro-optic modulators, microresonators, interferometers, optical switches, directional couplers and multiplexers (all claimed).    ADVANTAGE - (I) is more soluble and/or more stable compared to known poly(3,4-ethylenedioxythiophene)poly(styrenesulfonate) polymers. (I) can facilitate fabrication of a ductile film exhibiting tunable conductivity.    DETAILED DESCRIPTION - Polymer (I) comprising at least one (hetero)aryl repeating units of formula (-(A(R1))-) (1a) and (-(B1(R2))-) (2a), is new, where the polymer has a degree of polymerization of 100-1000.    A, B1 = phenylene, phenylene vinylene, pyrrolylene, pyrrolylene vinylene, thienylene, thienylene vinylene, fluorenylene, fluorenylene vinylene, furanylene, furanylene vinylene, phenothiazinylene, phenothiazinylene vinylene, phenazinylene, phenazinylene vinylene, phenoxazinylene or phenoxazinylene vinylene, which is optionally substituted with one or more substituents of OH, alkyl, alkenyl, alkynyl, alkanoyl, alkanoylamino, alkenoyl, alkynoyl, alkoxy, alkoxycarbonyl, alkoxycarbonylamino, alkylamino, alkylamino carbonyl, dialkylaminocarbonyl, alkylsulfonyl, alkylsulfinyl, sulfonylaminoalkyl, alkylsulfonylaminocarbonyl, aminoalkyl, cyanoalkyl, halo, haloalkyl, haloalkenyl, haloalkynyl, haloalkanoyl, haloalkenoyl, haloalkynoyl, haloalkoxy, haloalkoxycarbonyl, hydroxyalkyl, oxoalkyl, cycloalkyl, cycloalkenyl, cycloalkanoyl, cycloalkenoyl, cycloalkoxy, cycloalkoxycarbonyl, aryl, arylene, heterocycle, heterocyclyl, heteroaryl, heteroarylene, arylalkyl, heteroarylalkyl, arylalkanoyl, heteroarylalkanoyl, arylalkenoyl, heteroarylalkenoyl, arylalkynoyl, heteroarylalkynoyl, arylalkoxy, heteroarylalkoxy, aryloxy, heteroaryloxy, aryloxycarbonyl, heteroarylxoycarbonyl, arylalkoxycarbonyl, heteroarylalkoxycarbonyl, alkylthio, alkylthioalkyl, arylthio, arylsulfonyl or arylsulfinyl, or the substituents together may form an alkylene or alkenylene chain completing a 3, 4, 5, 6, or 7-membered aryl or alicyclic ring optionally including one or more divalent N, S or O, and the substituents being optionally substituted;    R1 = -C(R3)(R4)(R5);    R2 = -C(R6)(R7)(R8);    R3-R8 = H, alkyl, ammonium or -(K1-O)d-R9, with the proviso that at least one of R3-R7 and is ammonium or -(K1-O)d-R9;    K1 = 1 or 2C alkylene;    d = 1-3; and    R9 = OH, carboxylic acid, sulfonic acid, or alkyl (optionally substituted with OH).    INDEPENDENT CLAIMS are included for:    (1) a composition comprising (I);    (2) an electrically conductive layer formed from the composition;    (3) an article comprising at least one electrically conductive layer; and    (4) manufacturing an electrically conductive layer or film of an electronic device, comprising forming an intermediate composition comprising a solvent and an electrically conductive polymer (I), applying the intermediate composition to a substrate, and removing at least a portion of the solvent to yield the electrically conductive layer or film.